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| All-American Canal Terminal Reservoir | |
|---|---|
| Name | All-American Canal Terminal Reservoir |
| Location | Imperial County, California, United States |
| Coordinates | 32.8°N 115.4°W |
| Type | Reservoir / terminal basin |
| Inflow | All-American Canal |
| Outflow | Evaporation, seepage, limited agricultural return flows |
| Catchment | Colorado River watershed |
| Area | variable |
| Volume | planned operational capacity |
| Constructed | 21st century planning and construction phases |
| Operator | Imperial Irrigation District |
| Status | Operational / phased |
All-American Canal Terminal Reservoir is a regional water-storage facility completed to capture flows from the All-American Canal and provide operational flexibility for irrigation, salinity control, and water delivery in the Imperial Valley. The project interconnects with water infrastructure serving the Colorado River Compact region, Quechan Tribe lands, and transboundary systems near the U.S.–Mexico border. It functions within a network of Hoover Dam-era and post‑war facilities, interacting with institutions such as the Bureau of Reclamation and the U.S. Army Corps of Engineers.
Planning for a terminal reservoir emerged amid longstanding disputes dating to the Colorado River Compact (1922) and later negotiations under the Lower Colorado River Basin development programs. Debates involved stakeholders such as the Imperial Irrigation District, the Metropolitan Water District of Southern California, and the Secretary of the Interior during implementation of Minute 242 and Minute 323 (2017) discussions. The reservoir concept sought to address leakage mitigation identified after construction of the All-American Canal and to modernize conveyance following studies by the Bureau of Reclamation and environmental assessments influenced by rulings from federal courts, including the U.S. Court of Appeals for the Ninth Circuit. Early proposals dated to planning documents produced by the California Department of Water Resources and were shaped by consultation with the Quechan Tribe and environmental organizations such as the Sierra Club.
The facility is situated in Imperial County, California, adjacent to sections of the All-American Canal that parallel the U.S.–Mexico border. The site lies within the Imperial Valley agricultural matrix, near communities like El Centro, California and Brawley, California, and in proximity to Yuma, Arizona across the Colorado River. The reservoir occupies an engineered basin designed to balance storage volume, surface area, and hydraulic connectivity with nearby conveyance works such as the Canal Lining Project segments and pump stations operated by the Imperial Irrigation District and ties into regional nodes tied to Palo Verde Irrigation District service areas. Geologically, the site overlies sediments of the Salton Trough with considerations for seismic hazard near the San Andreas Fault system.
Design incorporated civil and hydraulic engineering practices codified by standards used by the Bureau of Reclamation and the U.S. Army Corps of Engineers. Key components included impermeable liners, seepage control measures informed by studies from the United States Geological Survey, intake and outlet structures compatible with the All-American Canal flow regime, and monitoring networks aligned with protocols from the Environmental Protection Agency. Construction contracts were awarded following procurement procedures overseen by the Imperial Irrigation District and involved contractors experienced with projects like the All-American Canal Lining Project and remediation work associated with the Salton Sea management programs. Engineering firms engaged included regional civil consultants that previously worked on facilities near Hoover Dam and Parker Dam.
Operational control integrates telemetry and SCADA systems consistent with basin operations coordinated between the Imperial Irrigation District, the Metropolitan Water District of Southern California, and federal entities such as the Bureau of Reclamation. The reservoir supports water delivery timing for crops important to the Imperial Valley economy, including ties to crop patterns managed under agreements influenced by the Lower Colorado River Multi-Species Conservation Program. It provides a buffer during Colorado River Drought Contingency Plan implementation and aids salinity management strategies aligned with the Water Quality Control Plan for the Colorado River Basin. Evaporation management and return-flow accounting follow reporting frameworks used in interstate water exchanges adjudicated through the Arizona v. California case legacy.
Environmental review examined effects on habitat for species protected under the Endangered Species Act, including impacts on riparian birds near the Salton Sea flyway and aquatic invertebrates in the Colorado River corridor. Mitigation measures referenced conservation actions from the Lower Colorado River Multi-Species Conservation Program and habitat offset proposals resembling projects undertaken by the U.S. Fish and Wildlife Service. Concerns raised by advocacy groups such as the Natural Resources Defense Council and tribal governments including the Quechan Tribe focused on groundwater interactions, impacts on wetlands in the Imperial Valley, and implications for migratory corridors documented by the Audubon Society. Monitoring follows criteria comparable to studies by the California Air Resources Board for dust control where exposed bed areas intersect regional air quality plans administered by the California Air Resources Board and the Imperial County Air Pollution Control District.
The reservoir exists amid legal frameworks shaped by interstate compacts like the Colorado River Compact and litigation precedents including Arizona v. California. Federal oversight has involved the Department of the Interior and negotiation instruments such as Minute 242 and subsequent Minute 323 (2017). Political debate has engaged the Imperial Irrigation District, the Metropolitan Water District of Southern California, tribal governments including the Quechan Tribe and the Cocopah Tribe, and state agencies such as the California Natural Resources Agency. Environmental review processes invoked the National Environmental Policy Act and consultations under the National Historic Preservation Act involving input from the California Office of Historic Preservation.
Economically, the reservoir affects irrigation reliability for agricultural producers in the Imperial Valley and service relationships with urban water suppliers like the Metropolitan Water District of Southern California, influencing market arrangements under water transfer agreements such as those mediated by the Colorado River Board of California. Social impacts include effects on local employment tied to construction and operations, community water access considerations raised by municipalities like El Centro, California, and tribal cultural-resource concerns raised by the Quechan Tribe and Cocopah Tribe. The project intersects with regional initiatives addressing the Salton Sea's environmental health and connects to broader regional planning efforts under agencies such as the California Department of Fish and Wildlife and economic development programs facilitated by the Imperial County Economic Development Corporation.
Category:Reservoirs in California Category:Imperial County, California